We have a number of webpages that pull data from Exchange 2007. We recently migrated these mailboxes to 2013.
It appears the code uses a URL http://xxxxx2007/exchange/mailbox which points to \.\backendstorage\ which doesn't exist in 2013 anymore and has nothing similar.
To add to the confusion according to Microsoft this \.\backendstorage\ URL in IIS was phased out after 2003 so not sure why we have one in 2007.
I simply cannot figure out what URL is the replacement for this in 2013, I immediately thought of EWS but this fails.
Anyone had issues like this with Exchange migrations and third party code before?