An Uncommon Reason Why Browsing CompanyWeb May Fail with HTTP Error 503 on SBS 2011 Standard – The Official SBS Blog – Site Home – TechNet Blogs:
http://blogs.technet.com/b/sbs/archive/2011/09/01/an-uncommon-reason-why-browsing-companyweb-may-fail-with-http-error-503-on-sbs-2011-standard.aspx

Okay so if it’s standard in your build document to opt into the customer experience reporting, I think we have a reason why after Exchange 2010 sp1, rollup 3 we’ve been seeing 503’s on servers and it didn’t make any sense of why we were seeing them.

If you opt into Customer experience, read that KB, it may give you the reason you got a 503 after updates.

 

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