SQL Server - Non-reindexed Database I have a database that has not been reindexed in the last 5 years.

I want a yes or no answer if databases without index maintenance and "Missing Rows" are related to each other.
Database index fragmentation and missing rows are not related. Fragmentation is mismatch in ordering of physical pages and clustering key. A fragmentation can never cause rows to go "missing".
No a database without index is NOT prone to corruption. Index just makes things faster period.