Office 365 & Mac Performance Issues – Using VirusScan for Mac 9.1?

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For those Mac users in Office 365, you may find that your SharePoint online document check-in/check-out operations are extremely slow and sometimes fail to complete.  MacAfee has reported that due to the way in which their anti-virus service works along with the way in which multiple files are downloaded during the check-out/check-in process, performance at this time degrades significantly, as explained below.

Note – It has been reported that disabling the service did NOT resolve this issue and users had to uninstall the MacAfee anti-virus application to resolve this issue.  MacAfee is currently working on this issue and if you need to continue using this anti-virus solution, please contact MacAfee to determine if a fix is available.


McAfee Security for Mac 1.x VirusScan for Mac 9.x Mac OS X Microsoft SharePoint Server Microsoft Office 2011


Slow performance when checking out documents from a Microsoft SharePoint server on a Mac. This issue occurs when checking out documents via a web browser or the Document Connector.


The delay occurs because multiple temporary files are generated under /var/folders/<temp folder path> when the documents are being checked out. These files are written, read, and deleted at a very high rate, causing VirusScan for Mac/Security for Mac to perform multiple scan actions. These multiple scan actions cause a degradation in performance on the Mac.


McAfee is investigating this issue, and a support ticket has been opened with Microsoft. This article will be updated as newer information becomes available.

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