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Why is "Updating Inbox" payload so large even when there are no emails received?


I have some users that are complaining that when they come in the morning and start their Outlook 2007/2010, they always get the message "Updating Inbox". This in itself is not a worry but what bothers me is that the size shown is around 20MB+. If I look through the emails that they had received between them closing Outlook and starting it up again, there is nothing more than 1MB.

Is there a way I can find out what is being pulled down when the updating happens? I need to find this since this could become an issue for our remote offices.

Our network has
Exchange 2010 with 2 CAS servers and 2 MBX Servers
All users are running either Outlook 2007 or Outlook 2010 in cache mode. The issue is seen in both versions of Outlook.

1 Solution
2010 outlook (as all previous) syncs the calendar by default (even if cached mode is off).
In addition, this version syncs the calendars of any attached mailboxes as well.

Do these users have additional mailboxes attached?
NivleshAuthor Commented:
Hi Postmaster

The users do not have any additional mailboxes. However, due to other issues, I will close this question. will award you the points since you did respond ;)

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