Best E-Invoicing Solutions for Microsoft Outlook

Zoho Billing is an all-in-one billing and revenue management platform for the entire quote-to-cash process, serving businesses from startups to large global enterprises. One platform, every billing model It natively supports one-time invoices, recurring billing, subscription management, usage monetization and project billing. A single invoice can combine a subscription plan, project hours, a setup fee, and tracked usage — no manual collation needed. Subscriptions and payments The full subscription lifecycle is automated: free trials, upgrades and downgrades with proration, mid-cycle changes, renewals, grandfathering, and cancellation workflows. Dunning sequences retry failed payments via fallback methods to recover at-risk revenue. Real-time dashboards surface MRR, ARR, churn, and customer lifetime value. Zoho Billing connects with Stripe, PayPal, Razorpay, and more, supports multiple currencies, and includes PCI DSS-compliant checkout and a self-service customer portal. Usage-based billing It provides support for metered, pay-as-you-go, tiered, volume, and prepaid credit models let businesses charge for modern consumption types — inputs, messages, actions, and outcomes. Automation, AI, and compliance CPQ turns approved quotes into invoices without re-entry. Workflow automation handles invoice generation, approvals, and event-triggered communications. AI surfaces anomalies, forecasts revenue, and summarizes reports, alongside Zia, a conversational billing agent. GST, VAT, US sales tax, e-invoicing, and localized templates support compliance for global teams.

OrdoGrid serves as an online invoicing and business-document solution tailored for freelancers and small enterprises, primarily emphasizing Belgian invoicing practices and the Peppol network. The platform allows users to generate and oversee various documents such as quotes, invoices, payment requests, receipts, and credit notes, while also enabling the conversion of quotes into invoices, emailing documents, and monitoring Peppol delivery confirmations. Additionally, it includes features for maintaining customer information, creating payment links, importing bank statements, and matching payments seamlessly. For project management, users can utilize Kanban boards to arrange tasks, track time dedicated to each project, and sync these tasks with calendars from Google, Outlook, or Apple. Businesses subscribed to the Business plan can access a REST API for further integration capabilities. OrdoGrid also provides a permanently free plan that allows users to receive an unlimited number of Peppol invoices and send one invoice monthly, alongside various paid subscriptions that offer enhanced document management, project tracking, and payment functionalities, ensuring users have flexible options to meet their needs. This comprehensive approach makes OrdoGrid an appealing choice for those looking to streamline their invoicing process effectively.

Coretool is an online invoicing platform designed specifically for freelancers, sole traders, tradespeople, small service businesses, and other enterprises in Germany. With this application, users can generate and oversee quotes and invoices, including compliance with XRechnung and ZUGFeRD e-invoicing standards, manage customer relationships, issue payment reminders, and schedule appointments. The software integrates GiroCode QR codes, facilitates digital signatures for quotes, and enables e-invoice document validation through its REST API. By utilizing API-based workflows, users can link Coretool with automation platforms like Make, Zapier, and n8n, though access to certain specialized modules may require approval. Additionally, it allows users to incorporate calendar feeds into Google, Apple, or Outlook calendars. An optional Kalkulations-Assistent feature aids in estimating projects, calculating materials and labor, and producing quotes. Coretool operates entirely within a web browser, eliminating the need for any local software installation. The free plan permits the issuance of three invoices each month, while the Solo plan is available for €9 per month plus VAT and offers the flexibility of monthly cancellation. Furthermore, the intuitive interface makes it easy for users to navigate through the various functionalities and enhance their invoicing experience.