Keep getting notifications that I am running out of disk space. Delete several GB of files, then a few hours later get the notifications again. I traced the problem down to an Outlook folder called "Calendar Attachments".

~/Library/Group Containers/UB???????.Office/Outlook 15 Profiles/Outlook/Outlook 15 Profiles/Main Profile/Data/Calendar Attachments

Looking by size inside one of the subfolders, it appears the same attachment is being replicated over and over. What can I do to fix this?


You do not need to remove the account from exchange.

  • just terminate outlook process (rightclick quit)
  • rename the directory
  • create a new one with same name (Calendar Attachments)
  • start outlook
  • if everything is ok, delete previous directory.

i did it already twice - first time removed 230GB of garbage, second time 80GB, after another 2 days (hardly using outlook) the directory is at 20gb again... it is a leak for sure.

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  • When i did this, the leak continued to gobble up disk space. removing the Exchange account in Outlook and readding it seemed necessary, in my case anyway. – Hafthor Jun 29 '18 at 1:48

The easy way to fix this is:

  • delete the outlook account w/ exchange server
  • quit outlook
  • rename the folder mentioned above
  • restart outlook
  • re-add the account

Note that Calendar Attachments folder is used for both Exchange based calendar items, as well as locally stored items which you may have archived.

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