Error 0x80070645 while trying to install Microsoft Security Essentials

http://simplecommunion.com/2010/11/brighthaven-intro Recently found an issue when trying to reinstall Microsoft Security Essentials on a Windows 7 machine after Sophos Cloud Protection was uninstalled. Constant tries of installing and making sure the machine had all Windows Updates installed and was clean after… Continue Reading


‘550 5.1.1 RESOLVER.ADR.ExRecipNotFound’ when sending email using Outlook in Office 365

Having recently carried out a migration from an on-premise Microsoft Exchange solution to Microsoft Office 365 we have had users receiving ‘550 5.1.1 RESOLVER.ADR.ExRecipNotFound’ non-delivery reports (NDRs). Users had all their email exported to PST files and then re-imported back… Continue Reading