Outlook is eating 60% and more CPU time when I open certain email folders e.g. Inbox, and it is returning to 3% CPU when I switch to e.g. the Concepts folder. Outlook is not using excessive CPU when in Calender, contracts or Tasks.

It started just a few weeks ago after a regular microsoft patch round. So I wonder if it has something to do with an update for Outlook.

When I open (pop out) a mail and then select the Concepts folder, the high CPU remains.

When I reply to a mail and pop out the reply and then select the Concepts folder CPU returns to normal.

Also when I open an extra .PST file like an archive and I swithc to folders in that file, on some folders CPU consumption is rising to 60% and more and selecting other folders does not increase CPU.

I started a fresh new profile and made only one email account (IMAP) with a few emails in it, but the behavior was the same. So it has nothing to do with the .PST or .OST files, but is looks like a problem of the Outlook program itself.

Configuration:

Toshiba R850 laptop with 8GB mem
Windows 8.1 Pro
Office 2013

Even more strange:

In folders with the View "show as conversations" I have the CPU problem. As soon as I de-select the conversation tick box the CPU usage returns to normal.

For me the 25-30% outlook idle consumption was due to an iCloud add-in.

File > Options  > Add-Ins > Manage COMM Add-ins "GO" then uncheck "iCloud Outlook Add-in" and restart Outlook

unfortunately no change.

As soon as I view a Outlook folder with "view as converstation" CPU rises to 60%

we are seeing some similar issues, seems due to kb2965270 (April2015) / kb3039799 (May2015)

We have a case open with MSFT, investigating....

we are seeing some similar issues, seems due to kb2965270 (April2015) / kb3039799 (May2015)

We have a case open with MSFT, investigati

Any feedback from MSFT yet (as I have the same issue) ?