I might want prescribed best programming to move OLM to Gmail then you can attempt effective programming like OLM Converter. This tool can process bulk data through a single processing way. You just need to enter the login credentials of your desired account of Gmail account.
If you don’t know how to convert OLM to Gmail then I want to suggest a perfect and trustworthy tool i.e. CubexSoft OLM to Gmail Tool which has too many wonderful benefits and features such as batch function, import corrupt OLM file, selective conversion, file naming options and many more. It’s also provides free trial edition for all users. It is very easy to use program for both professional and home users and it also supports batch migration at a time. To check this program capability and working functionality, then you must try the demo edition of the tool.
Read More: https://www.cubexsoft.com/olm/