Which accounts work, and how to add them
What Klasor can do depends on how the account was added to classic Outlook. The table shows what works and what we tested; the steps show how to add a Gmail or other IMAP account.
5 min read · updated Nov 8, 2026 · 3.0
Klasor works with classic (Legacy) Outlook for Mac. It sees the accounts that classic Outlook itself holds, and what it can do with each depends on the account type.
What works with which account
| Account type | How it appears in Outlook | Label and export | Free up space (move to Deleted Items) | Free the space now | Tested by us |
|---|---|---|---|---|---|
| Gmail added as IMAP | IMAP account (added with Other Email → IMAP, with an app password) | Yes | Yes | Yes | Yes, full cycle: export, move, restore |
| IMAP account on a private mail server (Postfix 2.10.1) | IMAP account | Yes | Yes | Only if you allow it (Advanced or Pro, with a confirmation) | Yes, full cycle: export, move, restore, and Free the space now with the Advanced option on |
| Gmail added with “Sign in with Google” | Account synced through Microsoft’s cloud | Not available: Klasor cannot see it | Not available | Not available | Not visible to Klasor. Add the account again as IMAP |
| iCloud Mail | IMAP account | Yes | Yes (same method as IMAP) | Only if you allow it (Advanced or Pro, with a confirmation) | Export yes; Free up space tested only on Gmail IMAP and on one private IMAP server (Postfix 2.10.1); try a small export first |
| Other IMAP (Yahoo, your provider, your own server) | IMAP account | Yes | Yes (same method as IMAP) | Only if you allow it (Advanced or Pro, with a confirmation) | Export yes; Free up space tested only on Gmail IMAP and on one private IMAP server (Postfix 2.10.1); try a small export first |
| Exchange on-premises | Exchange account | Supported by Outlook scripting, not tested by us | Off by default; can be allowed in Advanced or Pro mode with a confirmation | No | Not tested |
| Exchange Online / Microsoft 365 | No longer connects in classic Outlook since October 2026 | Not available | Not available | Not available | Not applicable |
| Outlook.com / Hotmail | Microsoft cloud account | Not tested | Not available | Not available | Not tested |
| POP | POP account | Not tested | Not available | Not available | Not tested |
| On My Computer (local folders) | Local folders | Yes | Not available | Not available | Export yes |
“Tested by us” means only what we verified ourselves, with Outlook 16.114 on a Mac. “Free up space” and “Free the space now” are explained in Free up space in Outlook, safely.
Exchange Online and Microsoft 365: since October 2026 classic Outlook can no longer connect to these mailboxes, so Klasor can’t work with them. For on-premises Exchange, Microsoft keeps classic Outlook working until October 2029. Details and sources: Legacy Outlook guide.
If your Gmail was added with “Sign in with Google”: adding it again as IMAP means removing the old account from Outlook first. Do that only after you have exported what you need. Outlook then downloads the whole mailbox again (hours for tens of GB), and the labels (categories) you set on the old account stay with it: they do not move to the new one. Try the new IMAP account on one small folder first.
How to add an account in classic Outlook
- Open AccountsIn Outlook, choose Tools → Accounts (or Outlook → Settings → Accounts).
- Add the accountClick + and choose Other Email.
- Enter the address and passwordType the e-mail address and the password, and choose IMAP as the account type.
- Fill in the serversEnter the incoming (IMAP) and outgoing (SMTP) servers of your provider, which it publishes on its help pages. For Gmail, see the values below.
- Check in KlasorOpen Klasor and scan. The account’s folders should appear.
Gmail: IMAP with an app password
- Turn on IMAP in GmailIn Gmail, open Settings → See all settings → Forwarding and POP/IMAP and enable IMAP.
- Create an app passwordIn your Google Account, turn on 2-Step Verification, then create an App password. Use it in Outlook instead of your normal password.
- Add the account as aboveIncoming server:
imap.gmail.com, SSL, port993. Outgoing server:smtp.gmail.com, SSL, port465or587.
If an account doesn’t appear in Klasor
- Make sure classic Outlook is open (Klasor reads your accounts from it) and try again.
- Check how the account was added. A Gmail account added with Sign in with Google is synced through Microsoft’s cloud and Klasor cannot see it. Add it again as IMAP, as described above.
- Exchange Online accounts no longer connect to classic Outlook (see above).
Good to know: the steps can look a little different depending on your Outlook version. If an account doesn’t appear in Klasor, check first whether it was added with “Sign in with Google”.