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Just finished migrating all mailboxes to Exchange 2013 SP1 CU5 on top of 2012R2 (VM, 4v CPU, 12GB RAM) and ran into noticeable slowness from all Outlook versions going against new 2013 server. So, tried everything Google returned on all the variations of queries we could think of for Outlook/Exchange slowness, from IPv6 on/off, TCP chimney disable, more v CPU, more RAM, VMXNET3 mods, common host for DCs and Exch, checking certs, new profiles, clean clients, etc. Locate and then click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\Current Control Set\Services\Tcpip\Parameters\Interfaces the interfaces will be listed underneath by automatically generated GUIDs like 3. Apparently without the Dword, Win7/2008R2 defaults to a 200ms timeout on ACKs; details can be found in the KB. Subtract that 200ms from the avg response we were seeing and that's about where they stand now; single digits to mid teens.

Nothing really helped, but did note that being in cached-mode does hide the problem from the end user for the most part (probably why the fix wasn't easier to find), and that Win8 was not "as" affected. Click each of the interface GUIDs and perform the following steps: a. Biggest problem for us was how to deploy without hitting each machine manually as those GUIDs appear to be random.

Fewer moving parts means sturdier and faster connection.

There’s another protocol for connecting to Exchange servers: EWS (Exchange Web Services).

Plus, it's an all or nothing process - if it's enabled, it will empty the folder every time you close Outlook.

Run Scan PST repeatedly, until it reports that there are no more errors.Finally opened a case with MS and after a day of log gathering and unhelpful suggestions they came back with the winner: Tcp Ack Frequency on the client side. On the Edit menu, point to New, and then click DWORD value. Name the new value Tcp Ack Frequency, and assign it a value of 1. Ended up using GP to push a ps script that enumerates the properties under \Interfaces, finds those that are actually connected, and adds the DWORD to each. Maybe it’s because the Windows version was built in the same shop as the Exchange service.This is normally automatically done by Outlook behind" [/quote] I just want to ask if these are the possible causes. I am a new employee here and was shocked that this IT Manager was promoted, by rumors, because of accidentally fixing about 10 years ago.Anyways, are those errors possible to happen in Outlook?

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