Have a small environment (<15 mailboxes). NEED to replace an aging Exchange 2010 server with Exchange 2013. Problem is E2K10 box is RTM - no service packs, updates, etc. Have tried in vain for hours to patch / update but I keep getting caught on pre-reqs, some of which don't even seem to be available for download/install anymore.
Seems best option is to backup/export mailboxes, public contacts, etc. and "uninstall" Exchange 2010. This, in theory, will clean up / remove Exchange from AD, allowing for clean installation of a new Exchange 2013 system. Downtime not a huge factor as will be done on weekend and have email queue on spam filter provider to hold messages while down.
Seeking advice / lessons learned / etc.