Outlook for Windows (classic app) will sometimes report that is does not have enough space to store mail data - even though your mailbox is small (below 50 GB).
This can occur when auto mapped delegate mailboxes are connected to your account, together adding to a larger amount of mail data to sync.
Outlook will download and store up to 50 GB or mailbox data to your local computer by default.
To work around the limitation, you can disable cached mode for the delegated mailboxes and compact your Outlook data file to try and alleviate the issue.
To do this, perform the following steps:
- Open Outlook, then click File. Click Account Settings then Account Name and Sync Settings.
- Make sure Use Cached Exchange Mode to download email to an Outlook data file is selected and that the Download email for the past slider is set to All. Then click More Settings.
- Click the Advanced tab. Under Cached Exchange Mode Settings, ensure Use Cached Exchange mode is check marked. Ensure Download shared folders and Download Public Folder Favorites is unchecked. Click Apply. Then click Outlook Data File Settings.
- Click Compact Now. Then click OK.
- Click OK, Next and Done to any open Outlook settings windows.
- Exit Outlook and reload it after 30 seconds.
Additional mailboxes will no longer store their content in Outlook data files. Only the primary mailbox user data will. This will mean that when accessing other user mailboxes, it will always retrieve their content from the cloud.
If Outlook still reports space issues, reduce the amount of data that is being synced. Perform step 1 and 2 and reduce the slider to clear older cached mail data from Outlook. The data is still stored in your mailbox - it is just removed from Outlook.
Contact Support for further options if still out of space.
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