What Are Shared Mailboxes?
Shared mailboxes are email accounts accessed by multiple users within an organization. Unlike personal mailboxes, shared mailboxes serve a team or function: support@company.com for customer service, sales@company.com for sales departments, info@company.com for general inquiries, billing@company.com for finance. In larger organizations, shared mailboxes also exist for departments, projects, and office locations.
Both Google Workspace and Microsoft 365 support shared mailboxes natively. And shared mailboxes accumulate large volumes of email because every team member's correspondence flows through the same account.
Why Shared Mailboxes Are Affected
The Same Root Cause
Shared mailboxes are affected by the same technical issue as personal mailboxes. When a migration tool transfers emails via IMAP APPEND, the destination server adds a "Received" header with the migration timestamp. Email clients display the migration date instead of the original. The mechanism is identical. See why emails show wrong dates after migration for the full explanation.
Higher Email Volume
Shared mailboxes typically contain far more emails than personal mailboxes. A support inbox active for five years may contain 50,000 to 200,000 messages. When all those messages display the migration date, the impact is amplified by the sheer volume.
Why Shared Mailbox Date Issues Are More Disruptive
Multiple Users Affected Simultaneously
When a personal mailbox has wrong dates, one person is inconvenienced. When a shared mailbox has wrong dates, every person who accesses it is affected. A support team of eight people all loses date-based sorting and search at the same time. That's not a minor annoyance.
Customer-Facing Impact
Shared mailboxes are often the primary contact point with customers. Support teams reference previous emails when handling cases. Sales teams look up past proposals by date. When date information is wrong, response times increase because staff can't find relevant history. How do you locate a client's original complaint from February when every email says it arrived on April 11?
SLA and Compliance Tracking
Many organizations track SLA compliance based on when emails were received. If every email shows the migration date, SLA calculations break. Reports measuring "average time to first response" become meaningless. For regulated organizations, this creates compliance risk.
Workflow and Automation Disruption
Shared mailboxes frequently have rules, filters, and automated workflows. Exchange rules that archive emails older than 90 days may suddenly archive everything or nothing. Power Automate flows that trigger based on received date produce incorrect results. These automated processes break until dates are corrected.
Special Considerations for Shared Mailboxes
Admin Access Is Required
Unlike personal mailboxes where the individual user can authorize access, shared mailboxes require administrator credentials. In Google Workspace, the admin must grant access via Service Account delegation. In Microsoft 365, a Global Admin or Exchange Admin must authorize the connection through Azure AD.
Coordinate With the Team
Because shared mailboxes are accessed by multiple users simultaneously, team members should be informed that they may see temporary duplicates during the correction process (the original is kept as backup while the corrected version is inserted). No downtime is required, users can continue working during processing.
Larger Mailboxes Take Longer
A personal mailbox with 3,000 emails takes just a few minutes to process. A shared mailbox with 80,000 emails takes proportionally longer. Processing can run during off-hours if preferred.
How Redate.io Handles Shared Mailboxes
Google Workspace
Redate.io connects via a Service Account with domain-wide delegation, providing access to any mailbox in the domain. The admin enters the shared mailbox email address, runs the free scan, and Redate.io's proprietary correction engine processes every affected email with the same multi-stage analysis pipeline used for personal mailboxes. Pattern matching across hundreds of known migration signatures, integrity verification on every corrected email, originals preserved in a backup folder for 30 days.
Microsoft 365
Shared mailboxes in Microsoft 365 are accessed through the same Azure AD application used for regular mailboxes. The Exchange Admin grants application permissions that cover both regular and shared mailboxes in the tenant.
IMAP-Based Shared Mailboxes
For shared mailboxes on other platforms (Zimbra, Dovecot, cPanel), Redate.io connects via standard IMAP using the mailbox credentials.
Pricing for Shared Mailboxes
Shared mailboxes are priced the same as personal mailboxes, based on the number of affected emails. Because shared mailboxes tend to have higher volumes, they may fall into a higher pricing tier. Organizations fixing multiple mailboxes qualify for volume discounts: 15% off for 5+ mailboxes, 25% off for 10+, and 35% off for 20+.
Frequently Asked Questions
Can team members keep using the shared mailbox during the fix?
Yes. Redate.io doesn't lock the mailbox. Team members can continue reading and sending emails. They may notice temporary duplicate messages as corrected versions are inserted alongside originals.
Does the fix apply to all folders?
Yes. Redate.io scans and fixes all folders including Inbox, Sent Items, custom folders, and subfolders.
What if the shared mailbox has more than 100,000 emails?
Contact Redate.io for a custom quote. Enterprise pricing is availble for exceptionally large shared mailboxes.
Ready to restore correct dates in shared mailboxes? Start a free scan to see how many emails are affected, and fix 10 for free to verify.