If you are looking to best and easiest tool for import OLM to iCLoud. I have lots of searching then and finally found an advanced software Aryson OLM Converter Tool.
This software provides many facilities like converting OLM to multiple formats like PST, EML, CSV, VCF, and ICS. It also contains an option to import OLM files into Gmail, Office 365, iCloud, Thunderbird, and other email clients. It also provides filter emails using the Date Range Filter to sort emails from a specific timespan. and This software is used by both technical users and non-technical users.
This software provides many facilities like converting OLM to multiple formats like PST, EML, CSV, VCF, and ICS. It also contains an option to import OLM files into Gmail, Office 365, iCloud, Thunderbird, and other email clients. It also provides filter emails using the Date Range Filter to sort emails from a specific timespan. and This software is used by both technical users and non-technical users.