The maximum database size is theoretically 140 TB, though this has not been tested. In practice, performance may degrade as you approach 100,000 records. However, this should be sufficient for any practical use.
There is no limit - you can create as many groups as you like. Group names are limited by 20 characters.
You can display as many columns as fit on your screen when maximized. However, it's best to show only essential columns to keep the table uncluttered. The search function scans all columns, even hidden ones, so visibility is not necessary for functionality.
If you have a database file from version 3.0 or newer (contacts.db), you can restore it directly (Database > Restore). Files from versions 2.0 - 2.8 (contacts.fdb) use an unsupported format.
No, groups exist at a single level. Hierarchical groups would complicate export/import functionality.
Instead, you can organize contacts using tags. See Working with tags for details.
No, a contact can belong to only one group. However, you can assign multiple tags to a contact as an alternative. See Working with tags for details.
The easiest way is to save the database file (Database > Backup). Backup files include a date stamp for easy identification.
By default, the program creates daily backups, which you can use for recovery or transfer. The best way to keep contacts synchronized between computers is to use Sync.
Yes, but not directly. You have two options:
Use Copy to new contact from the right-click menu or contact editor. This creates a new contact while copying all personal or business data except the first and last name. It is useful for quickly adding family members or employees of the same company.
The program automatically formats phone numbers, so you don’t need to enter spaces or punctuation. You can adjust the auto-format settings as needed. If your country has irregular phone formatting, you can disable auto-formatting. Learn more here.
This happens when no contact groups exist. First, create at least one group under ALL CONTACTS, then you can add contacts.
Excel may convert long numbers into an exponential format (e.g., 112147483641 → 1.12147E+11). To prevent this:
Your Gmail settings may be set to automatically add new contacts from emails. Disable this by following this guide.
If you used Sync: install E-Z Contact Book on your new system, log in, and sync to restore all contacts.
To restore corrupted or damaged database, see instructions on this page.
You must unregister your license on the old computer first: