Should I use Outlook in cached mode?

Notes: Cached Exchange Mode is the default when you add an Exchange or Microsoft 365 account. We recommend always using Cached Exchange Mode with an Exchange or Microsoft 365 account. Outlook.com
Outlook.com
Go to the Microsoft 365 sign-in page or to Outlook.com. Enter the email address and password for your account.
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accounts default to Cached Exchange Mode and cannot be changed.
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What happens if I turn off cached mode in Outlook?

The program will be slower to process changes in the Global Address List, or will be unable to find certain emails when you search for them.
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Should I use cached mode?

Cached mode is also very good for users with high latency connections to Exchange, as accessing the local cache isolates the user from delays in connectivity to the server. Searches done against the local OST are much faster, and the client generates much less network traffic.
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What does cached mode in Outlook mean?

Description. Exchanged Cache Mode enables a better experience when you use an Exchange account. In this mode, a copy of your mailbox is saved on your computer. This copy provides quick access to your data, and it is frequently updated with the server that runs Microsoft Exchange.
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What is the difference between Outlook cached mode and online mode?

There are two ways to connect Outlook to an Exchange account: Online Mode and Cached Exchange Mode. While Online Mode maintains a direct connection to an Exchange server, Cached Exchange Mode creates a local copy of the mailbox data stored on the Exchange server in an offline data file (. ost file).
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Outlook cached vs online



Why is Outlook using so much data?

Outlook Cached Mode

After first setting up a mailbox, Outlook will use a lot of bandwidth copying data from the server to the local machine. That's normal but should settle down once everything is copied over. If you increase the amount saved on the computer, that will also force more copying from the server.
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How can I improve my Outlook 365 performance?

Maximizing Performance with Outlook, Office 365 & MacroView
  1. Delay Non-Critical Updates. Frequent Microsoft updates can be extremely frustrating. ...
  2. Clean Up & Compact. ...
  3. Disable Non-Essential Add-ins. ...
  4. Minimize Logging. ...
  5. Unlock your Memory. ...
  6. Cache your Outlook. ...
  7. Reduce your File List. ...
  8. Get a Fast Disk.
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What is the purpose of cached Exchange mode?

Cached Exchange Mode enables a better experience when you use an Exchange account. In this mode, a copy of your mailbox is saved on your computer. This copy provides quick access to your data, and it is frequently updated with the server that runs Microsoft Exchange.
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Does cached Exchange Mode speed up Outlook?

Cached exchange mode

This mode speeds up performance because it bypasses the mail server (and several other systems), which can be slow to send and receive data.
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How do I reduce cache size in Outlook?

Reduce the size of an Outlook Data File (. pst)
  1. Click the File tab.
  2. Click Account Settings, and then click Account Settings.
  3. On the Data Files tab, click the data file that you want to compact, and then click Settings.
  4. Click Compact Now.
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What is E-mail cache?

Microsoft Outlook can cache (store) copies of your emails locally on your computer, so that it is faster to bring them up when you are looking through your mailbox. There are advantages and disadvantages to caching.
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What is cached Exchange mode in Outlook 365?

In cached exchange mode, a copy of your mailbox is saved on your computer. This copy provides quick access to your data, and it is frequently updated with the server that runs Microsoft Exchange. Notes: Cached Exchange Mode is the default when you add an Exchange or Office 365 account.
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How do you speed up Outlook?

Here's how to improve slow Microsoft Outlook performance
  1. Compact the MDaemon Connector Local Cache File.
  2. Perform Regular Housekeeping.
  3. Disable Outlook Add-Ins.
  4. Disable RSS Feeds.
  5. Adjusting the Send/Receive Frequency.
  6. Compact or Repair PST Files.
  7. Keep Windows Up-to-Date.
  8. Conclusion.
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Is there a limit to the number of folders in Outlook?

The limit of 500 shared folders has been a longstanding product limitation in Outlook for Windows since the dawn of cached mode (2003!)
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How do I know if Outlook is in online mode?

How do you know when you're working offline or online in Outlook? There are visual cues, starting with the status bar at the bottom of your Outlook window. If either of the following status indicators are shown, it means Outlook isn't connected to your mail server. You can't send or receive email until you reconnect.
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Why is my Outlook suddenly so slow?

If the problem no longer occurs when Outlook is running in Safe mode, it is likely that one of the add-ins is causing the performance issue. To troubleshoot possible problems that are caused by COM add-ins or Exchange Server client extensions, disable any items that you do not use regularly. Then, restart Outlook.
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Why is Outlook 365 running so slow?

Cause. This issue may occur for many reasons. This issue may be caused by an Exchange Online server issue. In this case, sign in to the Office 365 portal by using your administrator credentials, and then select service health to determine whether other customers are experiencing the same issue.
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Why is my Outlook so slow and not responding?

If Outlook stops responding at a screen that says "Processing," you can close Outlook, start it in safe mode, then close it and open it normally to fix the problem. Close Outlook. Launch Outlook in safe mode by choosing one of the following options. In Windows 10, choose Start, type Outlook.exe /safe, and press Enter.
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Does Outlook save emails locally?

When you use a POP3 account, all your Outlook data (emails, contacts, calendar, tasks and notes) is stored locally on your PC inside a pst-file. Your recommended backup strategy is to regularly make a copy of your pst-file to your backup location when Outlook is closed.
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What is the best way to archive emails in Outlook?

How to archive emails manually on Outlook:
  1. -> Select the File you want to archive.
  2. -> Then click Cleanup Tools > Archive.
  3. -> In the pop-up archive box, select “Archive this folder and all sub-folders”.
  4. -> Select a date under “Archive Items Older than”
  5. -> Check the box “include items with Do Not AutoArchive”.
  6. -> Click Ok.
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Is it safe to delete Outlook PST-file?

Removing an opened pst-file

If you want to remove a pst-file from Outlook, do not delete the file but disconnect/remove/close it in Outlook first. After removing it from Outlook, close Outlook to release the lock on the pst-file and then you can safely delete it.
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How do I make Outlook run faster on Windows 10?

To get you back to your email faster, here are six tips and tricks to boost Outlook performance on Windows 10.
...
  1. Disable add-ins.
  2. Disable graphics acceleration.
  3. Disable RSS feeds.
  4. Archive old email.
  5. Compact your PST files.
  6. Update Outlook and Windows 10.
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Can I turn off cached Exchange Mode?

Turn on or off Cached Exchange Mode

Click Account Settings, and then click Account Settings. On the E-mail tab, click the Exchange account, and then click Change. Under Microsoft Exchange server, select or clear the Use Cached Exchange Mode check box.
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How do I clean up my Outlook storage?

In Outlook, choose File> Cleanup Tools > Mailbox Cleanup.
...
Here are some ways to keep your mailbox size under control:
  1. Archive older items – Move old items you want to keep to an archive. ...
  2. Empty the Deleted Items folder – Empty the Deleted Items folder frequently to make sure you aren't keeping messages you don't need.
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Should I use cached Exchange Mode with Office 365?

We recommend always using Cached Exchange Mode with an Office 365 account. Online Mode works by using information directly from the server, and, as the name implies, it requires a connection. Mailbox data is only cached in memory and never written to disk.
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