Hi,
Migrating data from Outlook to an iPhone is quite a hassle because Apple doesn't provide support for MSG files in any way. The same problem was with me a few months back, and after trying out various tools, only TrustVare MSG to VCF Converter was able to give me the fully structured and accurate vCard files. It interprets the data in the MSG files in the same manner as Outlook; thus, no data gets corrupted.
So, it made for a perfect transfer to my iPhone because:
It can effortlessly handle a huge batch of MSG to vCard conversion without slowing down.
Converts notes, pictures, job titles, websites, and even custom fields
Creates vCards that both iPhone and iCloud can instantly use
There are no formatting issues, and no fields are mixed up.
Does not require an internet connection and thus, keeps the data secure
In case you are wondering how to
convert MSG to VCF with field integrity preserved all the time, this would be the most reliable solution that I have come across.