Today the Exchange CXP team released the following update rollups to the Download Center. All three releases cover Security Bulletin MS12-080. Because this is a security release, the updates will...
Updated Jul 01, 2019
Version 2.0
Blog Post
1 MIN READ
Released: Update Rollup 5 v2 for Exchange 2010 SP2, Exchange 2010 SP1 RU8 and Exchange 2007 SP3 RU9
@Johnny on the spot: If you've installed RU5v2, you will not be able to install RU4. Understand Windows Update/MU is displaying that even after you install RU5v2.
The OWA blank page issue is not the general experience. As of now, there are no escalations related to this issue. If you do experience it, please contact Support to troubleshoot.
Having installed RU5v2 on a bunch of servers, I personally haven't seen an issue with CRL checking nor long install times or the OWA blank page issue.
WRT coexistence with Exchange 2013, Exchange 2010 SP3 and Exchange 2007 RU for coexistence were earlier announced for a H1 2013 release and recently narrowed down to Q1 2013. You will not have to wait 6 months. See http://blogs.technet.com/b/exchange/archive/2012/12/03/exchange-server-2013-reaches-general-availability.aspx.