steveenmiller07
Member
Yes, importing an older PST can sometimes result in duplicate contacts, especially when the current Outlook profile already contains some of the same contact records. The same issue can happen when information is collected from several PST backups and combined into one mailbox.
Before removing anything, it is better to check whether the repeated entries are actually identical. Two contacts may have the same name but different phone numbers or email addresses, so deleting based only on the name could remove useful information.
For a large PST, manually checking every contact is not very practical. A dedicated duplicate-removal utility can compare the mailbox data and help identify repeated items. SysInfo Outlook Duplicate Remover, for example, supports duplicate removal from contacts as well as emails, calendars, and tasks. It can also work with multiple PST files and search for duplicates within folders or across PST files.
Another useful approach is to create a new PST containing the cleaned data instead of modifying the original backup. This gives you a separate copy to review before importing it back into Outlook.
I would also recommend keeping the original PST unchanged until the cleanup has been checked. If the mailbox contains important business contacts, having the original backup available is much safer than immediately deleting repeated records.
Before removing anything, it is better to check whether the repeated entries are actually identical. Two contacts may have the same name but different phone numbers or email addresses, so deleting based only on the name could remove useful information.
For a large PST, manually checking every contact is not very practical. A dedicated duplicate-removal utility can compare the mailbox data and help identify repeated items. SysInfo Outlook Duplicate Remover, for example, supports duplicate removal from contacts as well as emails, calendars, and tasks. It can also work with multiple PST files and search for duplicates within folders or across PST files.
Another useful approach is to create a new PST containing the cleaned data instead of modifying the original backup. This gives you a separate copy to review before importing it back into Outlook.
I would also recommend keeping the original PST unchanged until the cleanup has been checked. If the mailbox contains important business contacts, having the original backup available is much safer than immediately deleting repeated records.