If you want to resolve an error OST file, not Syncghronizing, so here I suggest you get SysInspire OST to PST converter software. This tool has many function that can help users in the conversion of OST files. It supports all versions of Windows OS. It has converted OST file into multiple file format such as OST to PST, EML, EMLX, Office 365, HTML, Yahoo Mail, Gmail, etc. It has a 10+ file format for conversions. It has a technical support all users can get help by email or live chat. It has a demo version that can convert 25 items from each folder of OST for free. After using the demo version users can get the paid version of the tool and get full access.

Read More: Resolve error OST file not Synchronizing