Older dovecot versions were using 3 different formats of uudis.
FORMAT_COMPACT
FORMAT_RECORD
FORMAT_MICROSOFT
Nowadays in 2.3 only the compact uuid format is used for mail uuid when converting from a string to uuid. However in certain migration szenarios, it is quite usefull to also support the alternative ones at least for compatibility reasons.
Dovecot provides:
guid_128_to_uuid_string and guid_128_from_uuid_string
Older dovecot versions were using 3 different formats of uudis.
FORMAT_COMPACT FORMAT_RECORD FORMAT_MICROSOFT
Nowadays in 2.3 only the compact uuid format is used for mail uuid when converting from a string to uuid. However in certain migration szenarios, it is quite usefull to also support the alternative ones at least for compatibility reasons.
Dovecot provides:
guid_128_to_uuid_string and guid_128_from_uuid_string