I am in the same boat as you. We were going to upgrade/migrate from EmailXtender to SourceOne, but after getting their cost estimate, we are taking a step back to see what options we have.
Have you had any luck getting your questions answered? I am just starting this journey!
Have you considered federating your indexes? There may be a way for you to move to Symantec Enterprise Vault and leave your EmailXtender indexes in place.
Please contact me directly if you are interested in discussing.
All the Best,
ISYS® Search Software|Scott Ward | Director of Sales, Americas
Denver Technology Center | 8765 E Orchard Rd | Denver | CO | 80111
303.689.9998 x234 (O) | 303.689.9997 (F) | 720.480.1273 (M)